[MERGE] (fixes #228058) Accept user names with @ in URLs

[Neil Martinsen-Burrell]

In an effort to find out just how trivial a trivial bug can be here's 
one where the fix was in the comments on the bug.  (Note that 
netloc.split('@',1) appears one additional place, in 
bzrlib/transports/http/__init.py, but the comment there indicates that 
code is no longer live and I'm not sufficiently versed on the 
HTTPTransports and how they are tested to do what that comment suggests.)

-- 
"The mathematician's best work is art, a high perfect art, as daring as
the most secret dreams of imagination, clear and limpid.  Mathematical
genius and artistic genius touch one another."
   -- Gosta Mittag-Leffler

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